Pressure gauge for tires



A. BADOWSKI PRESSURE GAUGE Fon TIRES Filed July 15 1921 fnl/enh?? Patented @et 23, i923.

barrier eerie ALFRED Benowsxr, or CHARLESTON, wnsr vrnernrn,

Erreurs, ro winnende varvn coaronarron.' orcirasnns'ron, wnsruvrnernra, .a

lCORPGMAEION QF WEST VIRGINIA.

Application led .l'uly 15, 1921. Serial Hal.

vextend through an opening in the felloe.

The pressure gauge of the present invention involves a hollow stem which is connected with the tire tube and in which is arranged a valve-carrying plunger, this plunger being subjected to the tube pressure indicating by its position' the tube pressure. Devices of this kind have heretofore been made. The present invention Vis directed primarily to the manner or" securing the spring resisting the movement of the plunger to the plunger. rlhis is or" importance due to the confined space in which the plunger and yspring must be arranged, a larger spring being better adapted for the purpose. A v

The invention is illustrated in the accompanying drawings as follows 1 shows a section of a, wheel rim with the plunger. It will be the pressure gauge in place.

F ig. 2 a central section through the gauge.

F ig. 3 an enlarged View of the end oi the spring.

Fig. 4f an alternative construction.

1 marlrs the wheel felloe, 2 the wheel rim, 3 the tire, and 4 the inner tube.

A stem 5 extends through an opening 6 in the felloe. tween which 'and Va washer 8 the tube is clamped by means or" a nut 9 on the stem 5.' The stem has a central opening 10 in which is arranged the sliding plunger 11. Y The plunger has an opening l2 extending through'it and an inflation valve 13 is arranged in this opening. The plunger in this instance forms a sliding the opening 10 and a `lrey 11V operates in a groove 11b in the plunger. The plunger is provided with arscale 11fE indicating the pres sure to which the parts are subjected.

The plunger has a projection 14e on which Y a rubber tube 15 is secured by means of a binding wire or thread 16. The inner end exaggerated over actual practice.

lt is provided withV a head 7 bef lunfrer said s rino" PD 7 b fit with the walls of rnnssunn eenen non riens.'

of the tuber extends over a an anchor plug 18,-vthis pl rated 'so as to Aextend ltheopenmgfrom the elastic tube to 'within the tire tube. The elastic tube is bound on the projectionv by a wire or thread 19.

A coil spring 20 is arranged around the elastic tube. The end 2l of the spring is ex tended axially and projects into 'an opening 22 in the end of the plunger. rlhe spring is preferably secured 1n this opening by oV setting the walls of the plungerardjacent to the opening at 23. This may be done by a prick punch or die which when` the wirel is in place indents the walls and forms anotset to the opening. The securing .of the spring may be made more certain by providing a deiiecti'on 24 in the spring as shown in lFig. 3, the drawing here being somewhat The oirthenefected at the setting of the wall is The inner end of point of thisdelico-tion. the spring is screwed 18 at 25. ,j

In the alternative construction-the parts are'similar except that the plunger has a shoulder'l26 which is'adapted to engage a shoulder 27 at the upper end of the stern thus preventing an accidentalvdischarge of understood, however', that the spring has a range greater than the ordinary inflation pressure of the tire. v Y

What claim as new is v 1. In a pressure gauge for pneumatic tires, the combination with a stem; a valve-carrying plunger in the stem subjected to tube pressure and movable in response to said pressure; an elastic tube maintaining communication between the plunger and the inner end of the stern, of a coil spring within the'steni resisting the movement of the havingV an axially eX- tendingend; and means for securing end to the plunger. f i 2. ln a pressure gaugefor pneumatic tires, the combination with a stern; of a valvecarrying plunger in the stern subjected to pressure and movable in response-to saidpressure, said plungerhaving an axial opening extending inwardly from its end;a coilv projection 17ndvv :ug .being perfoon to the anchor plugy y ignara Assiette-n, er innerenAssrern-v I carrying plunger in the stein subjected toV axially extending end projecting into the opening in the plunger; and means for securing said end in the opening.

3. ln a pressure gauge for pneumatic tires,

the combination with a stem; of a valvepressure and movable in response to said pressure, said plunger having an axial opening extending inwardly from its' end; a coil spring Within the stein resisting the inoveinent of the plunger, said spring having en axially extending end projecting into the opening in the plunger; and means for securing said encl in the opening comprising an offset in the Wall of the opening.

il. ln a pressure gauge for pneumatic tires,

refines@ ln testimony whereof l have hereunto set 3U my hand. ,Y

ALFRED BADSJH. 

